GB880238A - Protective arrangements for electric circuits and apparatus - Google Patents
Protective arrangements for electric circuits and apparatusInfo
- Publication number
- GB880238A GB880238A GB40632/58A GB4063258A GB880238A GB 880238 A GB880238 A GB 880238A GB 40632/58 A GB40632/58 A GB 40632/58A GB 4063258 A GB4063258 A GB 4063258A GB 880238 A GB880238 A GB 880238A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earth
- relay
- supply
- trigger electrode
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
- H02H5/105—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection responsive to deterioration or interruption of earth connection
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
880,238. Protective cut-out arrangements. GERRARD, M. C. Dec. 15, 1959 [Dec. 16, 1958; July 24, 1959], Nos. 40632/58 and 25434/59. Class 38 (5). [Also in Group XL (c)] A protective arrangement comprises a trigger device T, e.g. a cold cathode tube or a transistor, connected in one arm of a bridge circuit B of which one diagonal is connected across the supply circuit to the protected apparatus and the other diagonal includes the coil A of a relay having contacts in the supply circuit, the trigger electrode of the device T being connected to a point in a potential divider P connected between the live supply conductor L and an earth loop for the apparatus. Under normal conditions the device T is non-conducting, the bridge is unbalanced and relay A is energized. If the earth loop is not continuous or if the neutral earth is unsatisfactory the lower end of the potentiometer ceases to be at earth potential so that the voltage at the trigger electrode rises. The device T conducts so balancing the bridge and causing the relay A to open. To provide protection in the event of an earth fault, a differential transformer may have its primary windings in the supply conductors and its secondary winding in the earth loop or in the lower part of the potentiometer P or in the connection to the trigger electrode. Alternatively, a transformer may have its primary winding connected in the earth line E2 and its secondary winding in the connection to the trigger electrode of the device T. When the supply is alternating current, a rectifier G is used and voltage stabilization is provided by one or more non-linear resistors M or neon tubes (not shown). A rest push-button switch may be connected across the device T and a test push-button may be arranged in the earth loop, Fig. 2 (not shown). A resistor R and change-over contacts H of the relay may be provided to ensure that the initial closing of the relay is dependent on the supply earth being satisfactory.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB40632/58A GB880238A (en) | 1958-12-16 | 1958-12-16 | Protective arrangements for electric circuits and apparatus |
| US859782A US2999189A (en) | 1958-12-16 | 1959-12-15 | Protective arrangements for electrical circuits and apparatus |
| DEG30150A DE1130052B (en) | 1958-12-16 | 1960-07-25 | Automatic fuse to protect electrical consumers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB40632/58A GB880238A (en) | 1958-12-16 | 1958-12-16 | Protective arrangements for electric circuits and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB880238A true GB880238A (en) | 1961-10-18 |
Family
ID=26264456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB40632/58A Expired GB880238A (en) | 1958-12-16 | 1958-12-16 | Protective arrangements for electric circuits and apparatus |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2999189A (en) |
| DE (1) | DE1130052B (en) |
| GB (1) | GB880238A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135542A (en) * | 1983-02-19 | 1984-08-30 | Ashley Accessories Ltd | Earth leakage circuit breaker |
| GB2152775A (en) * | 1983-11-28 | 1985-08-07 | B & R Electrical Prod Ltd | Reversed conductors auto-tripping system |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3222663A (en) * | 1961-10-30 | 1965-12-07 | Gerald H Dennis | Ground fault detecting device |
| US3189592A (en) * | 1962-08-23 | 1965-06-15 | Phillips Petroleum Co | Production of bimodal cispolybutadiene |
| US3319124A (en) * | 1964-01-27 | 1967-05-09 | Electronic Instr Corp | Electrical circuit protective apparatus |
| US3319122A (en) * | 1964-06-01 | 1967-05-09 | Electronic Instr Corp | Electrical circuit control apparatus |
| US3317650A (en) * | 1965-03-29 | 1967-05-02 | Univ Iowa State Res Found | Electrical ground net |
| US3366840A (en) * | 1965-10-22 | 1968-01-30 | Electronic Instr Corp | Ground fault protective apparatus |
| US3863238A (en) * | 1969-10-10 | 1975-01-28 | Honeywell Inc | Dual ground integrity monitoring circuit |
| US3708721A (en) * | 1972-02-29 | 1973-01-02 | Whirlpool Co | Electrical connection and ground monitor |
| US3809961A (en) * | 1972-05-25 | 1974-05-07 | Albany Int Corp | Electric outlet sentinel |
| US3917979A (en) * | 1974-03-18 | 1975-11-04 | Borg Warner | Protection circuit for an adjustable motorized hospital bed |
| US4016489A (en) * | 1974-10-04 | 1977-04-05 | Hill-Rom Company, Inc. | Ground-test circuit with minimal ground current |
| US4011483A (en) * | 1974-11-07 | 1977-03-08 | The Ohio Brass Company | Ground wire monitoring system |
| US3996496A (en) * | 1974-11-25 | 1976-12-07 | Borg-Warner Corporation | Ground integrity monitor for electrical apparatus |
| US4025822A (en) * | 1975-08-05 | 1977-05-24 | Hughes W Taliaferro | Two to three-wire converter circuit |
| US4028594A (en) * | 1975-11-07 | 1977-06-07 | Schossow George W | Safety circuit for electrical equipment |
| US4023073A (en) * | 1975-12-08 | 1977-05-10 | Graco Inc. | Open circuit detector |
| US4087846A (en) * | 1976-10-27 | 1978-05-02 | Hughes W Taliaferro | Protective circuit apparatus |
| US4375660A (en) * | 1981-02-03 | 1983-03-01 | Tektronix, Inc. | Ground isolation monitoring apparatus having a protective circuit |
| US4520417A (en) * | 1983-02-14 | 1985-05-28 | Raychem Corporation | Electrical monitoring systems |
| US5514967A (en) * | 1994-08-16 | 1996-05-07 | Zelm; Richard J. | Automatic insulation test equipment for testing high voltage electrical equipment at the rated voltage level |
| US7463124B2 (en) * | 1998-08-24 | 2008-12-09 | Leviton Manufacturing Co., Inc. | Circuit interrupting device with reverse wiring protection |
| US7400477B2 (en) | 1998-08-24 | 2008-07-15 | Leviton Manufacturing Co., Inc. | Method of distribution of a circuit interrupting device with reset lockout and reverse wiring protection |
| US7737809B2 (en) | 2003-02-03 | 2010-06-15 | Leviton Manufacturing Co., Inc. | Circuit interrupting device and system utilizing bridge contact mechanism and reset lockout |
| CN103474300B (en) | 2008-07-07 | 2016-03-09 | 立维腾制造有限公司 | A kind of fault circuit interrupter device |
| US7924537B2 (en) * | 2008-07-09 | 2011-04-12 | Leviton Manufacturing Company, Inc. | Miswiring circuit coupled to an electrical fault interrupter |
| US20120078546A1 (en) * | 2010-09-28 | 2012-03-29 | Maxim Integrated Products, Inc. | Load-side voltage detection via electric metering processing |
| US10634710B1 (en) * | 2018-10-31 | 2020-04-28 | Wisk Aero Llc | Ground network monitoring system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE506749C (en) * | 1930-09-11 | Eugene Hamm | Control device for earth fault lines in AC systems | |
| DE596044C (en) * | 1929-04-13 | 1934-04-26 | Krogsgaard & Becker | Protective device for electrical systems |
| DE652926C (en) * | 1932-01-31 | 1937-11-10 | Siemens Schuckertwerke Akt Ges | Switch-on device on an electrical power consumer with a contact protection line |
| FR778599A (en) * | 1933-10-17 | 1935-03-15 | ||
| DE698537C (en) * | 1938-07-08 | 1940-11-12 | Aeg | in AC systems |
| US2207202A (en) * | 1938-12-23 | 1940-07-09 | Deau James La | Grounding safety switch and alarm for electrical apparatus |
| DE739385C (en) * | 1940-12-19 | 1943-09-23 | Robert Wacker Kom Ges | Arrangement for the automatic monitoring of the earth protection line on preferably portable electrical machines, devices and apparatus |
| US2554598A (en) * | 1946-10-08 | 1951-05-29 | Western Electric Co | Safety system for portable electrical apparatus |
| DE1049486C2 (en) * | 1957-03-13 | 1959-07-16 | Cornelius Gerrard Cheadle Hume Cheshire Michael (Großbritannien) | PROTECTIVE DEVICE FOR CIRCUITS AND ELECTRICAL EQUIPMENT |
-
1958
- 1958-12-16 GB GB40632/58A patent/GB880238A/en not_active Expired
-
1959
- 1959-12-15 US US859782A patent/US2999189A/en not_active Expired - Lifetime
-
1960
- 1960-07-25 DE DEG30150A patent/DE1130052B/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2135542A (en) * | 1983-02-19 | 1984-08-30 | Ashley Accessories Ltd | Earth leakage circuit breaker |
| GB2152775A (en) * | 1983-11-28 | 1985-08-07 | B & R Electrical Prod Ltd | Reversed conductors auto-tripping system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1130052B (en) | 1962-05-24 |
| US2999189A (en) | 1961-09-05 |
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